如何将音频文件保存在核心数据中并发送到服务器？

Question

我正在创建录制音频并将该文件保存在设备中，然后我要发送到服务器。为此我正在写这样的代码

_playAudioOutlet.enabled = NO; 
_stopRecording.enabled = NO; 

NSArray *dirPaths; 
NSString *docsDir; 

dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
docsDir = dirPaths[0]; 

NSString *soundFilePath = [docsDir stringByAppendingPathComponent:@"sound.caf"]; 

NSLog(@"%@",soundFilePath); 
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath]; 

NSDictionary *recordSettings = [NSDictionary dictionaryWithObjectsAndKeys: 
           [NSNumber numberWithInt:AVAudioQualityMin], 
           AVEncoderAudioQualityKey, 
           [NSNumber numberWithInt:16], 
           AVEncoderBitRateKey, 
           [NSNumber numberWithInt: 2], 
           AVNumberOfChannelsKey, 
           [NSNumber numberWithFloat:44100.0], 
           AVSampleRateKey, 
           nil]; 

NSError *error = nil; 

AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; 

_audioRecorder = [[AVAudioRecorder alloc] 
        initWithURL:soundFileURL 
        settings:recordSettings 
        error:&error]; 

if (error) 
{ 
    NSLog(@"error: %@", [error localizedDescription]); 
} else { 
    [_audioRecorder prepareToRecord]; 
} 
// to start recording... 

- (IBAction)startRecording:(UIButton *)sender { 

if (!_audioRecorder.recording) 
{ 
    _playAudioOutlet.enabled = NO; 
    _stopRecording.enabled = YES; 
    [_audioRecorder record]; 
} 

} 

// To stop recording 
- (IBAction)stopRecording:(UIButton *)sender { 

_stopRecording.enabled = NO; 
_playAudioOutlet.enabled = YES; 
_startRecording.enabled = YES; 

if (_audioRecorder.recording) 
{ 
    [_audioRecorder stop]; 
} else if (_audioPlayer.playing) { 
    [_audioPlayer stop]; 
} 

} 

// TO play audio 

- (IBAction)playAudio:(UIButton *)sender { 

if (!_audioRecorder.recording) 
{ 
    _stopRecording.enabled = YES; 
    _startRecording.enabled = NO; 

    NSError *error; 

    _audioPlayer = [[AVAudioPlayer alloc] 
        initWithContentsOfURL:_audioRecorder.url 
        error:&error]; 

    _audioPlayer.delegate = self; 

    if (error) 
     NSLog(@"Error: %@", 
       [error localizedDescription]); 
    else 
     [_audioPlayer play]; 
} 
} 

我正在写这样的代码......它工作正常。但是现在我想将这些数据存储在核心数据中，并保存了我想发送的数据之后。为此，我创建了核心数据和实体名称：保存，属性名称：保存类型二进制数据。但我得到错误。 任何人能给出解决方案，这...

- (IBAction)stopRecording:(UIButton *)sender { 

// Get conntext 
appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate]; 
context = appDelegate.persistentContainer.viewContext; 

// Save data 
NSManagedObject *newSong; 
newSong = [NSEntityDescription 
      insertNewObjectForEntityForName:@"Save" 
      inManagedObjectContext:context]; 
NSError *error; 

NSURL *urlOfRecording = _audioRecorder.url; 
NSString *url = [urlOfRecording absoluteString]; 
NSLog(@"in saveRecording, the url is: %@",url); 
[newSong setValue:url forKey:@"save"]; 
[context save:&error]; 
// status.text = @"Song Saved!"; 

_stopRecording.enabled = NO; 
_playAudioOutlet.enabled = YES; 
_startRecording.enabled = YES; 

if (_audioRecorder.recording) 
{ 
    [_audioRecorder stop]; 
} else if (_audioPlayer.playing) { 
    [_audioPlayer stop]; 
} 

} 

Answer 1

Coredata有一个“允许外部存储”选项保存与coredata它会自动存储文件超过1MB的磁盘较大的二进制数据时。您已经将数据保存在应用程序文档字典中。因此，只需从文档目录中提取数据并使用HTTP/UDP将其发送到您的服务器（无论什么协议）。 从目录中获取数据：

dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
docsDir = dirPaths[0]; 

NSString *soundFilePath = [docsDir stringByAppendingPathComponent:@"sound.caf"]; 
NSData dataToBeSentInServer = [NSData dataWithContentsOfURL: soundFilePath]; 

Answer 2

按this链接你没有存储任何的音频文件在你的核心数据做。您可以存储在本地目录中，然后使用后台线程上传到服务器。